PM7385 FREEDM-84A672
DATA SHEET
PMC-1990114
ISSUE 6
84 LINK, 672 CHANNEL FRAME ENGINE AND DATA LINK MANAGER
WITH ANY-PHY PACKET INTERFACE
Figure 19 – Receive APPI Timing (Boundary Condition)
RXCLK
RXADDR[2:0]
RPA
Dev 0
NULL
Dev 7
Dev 0
NULL
Dev 6
Dev 7
NULL
Dev 4
Dev 6
NULL
Dev 4
Dev 7
Dev 1
NULL
Dev 7
Dev 3
Dev 1
NULL
Dev 2
Dev 3
NULL
Dev 2
RENB
Dev 7
D8
RXDATA[15:0]
RVAL
CH 2
D0
D1
D2
D3
CH 1
D9
RSX
REOP
RMOD
RERR
Figure 19 shows the boundary condition where a packet transfer completes
shortly after the external controller has set RENB high to pause the FREEDM-
84A672 device. The second data transfer is the final two words of a packet for
FREEDM-84A672 device 7, channel 1.
When FREEDM-84A672 device 0 places D2 on RXDATA[15:0], the external
controller sets RENB high to pause the FREEDM-84A672 device. In the
following RXCLK cycle, the FREEDM-84A672 provides D3 on RXDATA[15:0] and
sets REOP high to conclude packet transfer. The external controller samples
REOP high while RENB is high and recognizes that the packet transfer is
complete. The external controller now knows that it doesn’t need to reselect
FREEDM-84A672 device 0, but can select another FREEDM-84A672 device
sharing the Rx APPI. The external controller decides to select FREEDM-84A672
device 7 by placing this address on the RXADDR[2:0] signals. The external
controller sets RENB low to commence data transfer from FREEDM-84A672
device 7.
12.6 Transmit APPI Timing
The transmit Any-PHY packet interface (APPI) timing is shown in Figure 20. An
external controller provides data to the FREEDM-84A672 device using the
transmit APPI. The following discussion surrounding the transmit APPI functional
timing assumes that multiple FREEDM-84A672 devices share a single external
controller. The three most significant bits of TXADDR[12:0] perform device
selection for purposes of polling while the ten least significant bits provide the
channel poll address. All Tx APPI signals are shared between the FREEDM-
84A672 devices.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
214
PMC [ PMC-SIERRA, INC ]
